backbone 1.1.0: http://backbonejs.org
Backbone.js gives structure to web applications by providing models with key-value binding and custom events, collections with a rich API of enumerable functions, views with declarative event handling, and connects it all to your existing API over a RESTful JSON interface.

datejs 1.0 Alpha-1: http://www.datejs.com
Datejs is an open-source JavaScript Date Library.  Comprehensive, yet simple, stealthy and fast. Datejs has passed all trials and is ready to strike. Datejs doesn’t just parse strings, it slices them cleanly in two.

qunit 1.12.0: http://qunitjs.com
QUnit is a powerful, easy-to-use JavaScript unit testing framework. It's used by the jQuery, jQuery UI and jQuery Mobile projects and is capable of testing any generic JavaScript code, including itself!

spinjs 1.2.7: http://fgnass.github.io/spin.js
Spin.js dynamically creates spinning activity indicators that can be used as resolution-independent replacement for AJAX loading GIFs.

underscore 1.6.0: http://underscorejs.org
Underscore is a JavaScript library that provides a whole mess of useful functional programming helpers without extending any built-in objects. It’s the answer to the question: “If I sit down in front of a blank HTML page, and want to start being productive immediately, what do I need?” … and the tie to go along with jQuery's tux and Backbone's suspenders.

underscore.string 2.3.2: https://github.com/epeli/underscore.string
String manipulation extensions for Underscore.js javascript library.